【作者】 张红春；

【导师】 戴经梁；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2008， 博士

【摘要】 半刚性基层沥青路面的路基、底基层、基层和面层任一结构层发生了开裂,其裂缝均在对应处向其上一结构层和下一结构层反射,所以半刚性基层沥青路面抗裂,要综合考虑影响半刚性基层沥青路面开裂的各种因素,采用多途径、多渠道从整体出发自下而上逐层解决半刚性基层沥青路面的开裂问题。路基方面:主要从施工入手,重点解决压实度检测问题和沉降观测问题,减小路基的不均匀沉陷问题。底基层方面:提出用低剂量(水泥剂量2.5%~3%)骨架密实水泥稳定碎石底基层结构,代替传统的易开裂的水泥土、石灰土、二灰土等底基层结构。基层方面:通过成型方式的变革(振动成型)和级配的优化(骨架密实结构)解决基层裂缝问题。1.提出了振动成型骨架密实水泥稳定碎石基层的优化级配和不同设计强度下的水泥剂量;2.通过对不同的悬浮结构级配和骨架密实结构级配在不同成型方式下的干燥收缩试验和断裂韧度试验,分析了成型方式、级配、0.075mm以下粉料的含量、施工季节、施工的均匀性、含水量、水泥剂量等因素对静压成型悬浮结构和振动成型骨架密实结构水泥稳定碎石基层裂缝的影响;3.用损伤力学和断裂力学理论分析、通过有限元计算和试验验证三条途径论证了骨架密实水泥稳定碎石基层的抗裂机理。4.运用损伤力学和断裂力学理论、数理分析、线性回归方法,归纳了振动成型骨架密实水泥稳定碎石基层开裂预估的经验公式。5.应用ANSYS有限元软件计算了裂纹的疲劳寿命和应力强度因子。为解决在利用有限元分析水泥稳定碎石基层的断裂与损伤时,无法反映级配结构对疲劳寿命和应力强度因子的影响问题,提出用裂纹扩展权(Rmin)来表征悬浮结构和骨架密实结构。6.提出了与振动成型方式和骨架密实结构级配配套的施工技术。沥青面层方面:通过上面的综合措施,解决面层以下的开裂问题,基本消灭反射裂缝。1.通过GTM成型方式、骨架密实结构级配优化和组合式碾压技术的使用,从材料、设计和施工入手解决沥青路面开裂问题。2.用损伤力学和断裂力学理论分析、采用有限元计算和试验验证三条途径论证了用GTM设计的骨架密实沥青混合料的抗裂机理。3.通过采用GTM的AC-13型沥青混合料级配优化研究和低温弯曲试验、低温疲劳试验和开裂温度试验,提出了基于抗裂性能的沥青混合料骨架密实结构级配设计方法。4.提出了与GTM成型方式配套的路面施工技术。施工及检测技术1.利用瑞雷波检测压实度精度高、无损、速度快的优点解决传统的压实度检测费时、费力、易造假等问题;2.建立了组合式碾压的力学模型,并进行了组合式碾压提高路面抗裂水平的机理分析。试验路:试验路研究表明半刚性基层沥青路面综合抗裂技术,理论上先进,技术上可行,工程应用效果好。更多还原

【Abstract】 The any structure layer of the subgrade , the subbase , the base and the pavement of semi- rigid base asphalt pavement took place to split, the cracks will reflect to its up and next structure layer at corresponding place. So in order to resist cracking ,we must synthetically consider various sorts of elements of influencing semi- rigid base asphalt pavement cracking, and from whole set out,adopt many path, many outlet ,from next to up gradually the layer solve the cracking problem of semi- rigid base asphalt pavement.SubgradeFrom construcking, point solve the problem of compactness detecting and subgrade settlement observation, solve the subgrade settlement bad-distributed problem.SubbasePut forward using low dosage(cement dose 2.5%~3%) framework dense gradation cement stabilized macadam subbase structure, replace traditional and easy cracking cement soil, lime soil, lime-fly ash etc. subbase structure.BaseSolving the base cracking problem through the change of forming method and gradation optimization.1. Put forward to the optimization gradation of vibration forming framework dense gradation cement stabilized macadam base, and cement dose of different design strength.2. Passing to the dry shrinking experiment and fracture toughness experiment of different gradation of suspended and framework dense in different forming method, analysising the influence of forming method, gradation, powder content less than 0.075 mm, construction season, construction well-distributed, moisture capacity, cement dose etc.to static forming method suspended gradation and vibration forming method framework dense gradation cement stabilized macadam base cracking.3. Using the analysising of damage and fracture mechanics theories , limited dollar calculating and testing proving there approach to discuss anti-cracking mechanism of framework dense gradation cement stabilized macadam base.4. Using the damage mechanics and fracture mechanics theories, the methods of mathematic statistic and linear regression to estimate the cracking distance of framework dense gradation cement stabilized macadam base.5. Application ANSYS limited dollar software to calculate fatigue life used and crack stress intensity factor . For solve at make use of a limited dollar to analysis damaging and fracturing of cement stabilized macadam base, can’t reflection the problem of gradation influence fatigue life used and crack stress intensity factor, put forward using crack expanding weighting (Rmin) to indicate suspended gradation and framework dense gradation.6. Put forward to the construction technique complete set of vibration forming method and framework dense gradation.Pavement Passing the synthetically measure before, to solve all the cracking problem under the pavement, essentially dispel the reflection.1. This text is main to solve the bad-distributed problem causing of asphalt road cracking through GTM forming method, framework dense gradation optimization , using aggregate rolling technique, design and construction.2. Using the analysising of damage and fracture mechanics theories , limited dollar calculating and testing proving there approach to discuss anti-cracking mechanism of framework dense gradation bituminous mixtures designed with GTM.3. Passing optimization study of AC-13 asphalt mixtures designed with GTM, low temperature bend experiment, low temperature fatigue test and cracking temperature experiment, put forward a framework dense gradation bituminous mixtures design method according to the anti- cracking function.4. Put forward to the construction technique complete set of GTM forming method and framework dense gradation.Construcking and Detecting Technique1. Using Rayleigh wave to detect compactness possesses the excellence of high precision, no damaging and speed quick, we can use it to solve the problems of costing a lot of time and work, and easy taking disguise etc. when we detect compactness use traditional method.2. Establishment a mechanics model of aggregate rolling method, and analysising the mechanism that can improve pavement anti-cracking level.Test roadTest road research enunciate that the comprehensive anti- cracking technique of semi- rigid base asphalt pavement is advanced in theories, the technique is practicable, engineering application is effective.更多还原